What do you use for personal information management?

I’ve used Palm, Outlook/Windows Mobile/GoodLink, Entourage, iCal/Address Book, Sunbird, and the Sidekick 2 for Personal Information Management, and I still haven’t found a solution that has everything I want. In general, I’m a big fan of the Sidekick II and its PIM suite, but it’s not perfect. First, it locks you into the Sidekick/Danger/T-Mobile platform, and second, their web interface is actually worse and less convenient than the UI on the Sidekick. Outlook is pretty nice, but isn’t very cross-platform friendly. Entourage was terrible last time I used it, Apple’s PIM suite is incomplete, and Palm, after all these years, is still missing basic functionality. My questions to you all are:

  1. Do you use PIM software at all?
  2. If so, what do you use, and what do you like/dislike about it?
  3. What devices and/or platforms is your data available on?